body {
    background-color: #7FaaD4;
}

#main {
    padding: 0.25rem;
    margin: 0 auto;
}

.sex .center_content {
    width: 100%;
}

.sex .center_content > .btn {
    width: 50%;
}

.panel_content {
    padding: 1.875rem;
}

.center > div {
    margin-top: 10px
}

@media (min-width: 768px) {
    #main {
        padding: 2rem;
    }
}